dt-bindings: iio: dac: ad5449: Add missing binding document.

Documenting existing binding, so little flexibility available.
2 channel devices that require separate reference voltages.

Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Nuno Sá <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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